Origin of the effective mobility in non-linear active micro-rheology

The distinction between the damping coefficient and the effective non-linear mobility of driven particles in active micro-rheology of supercooled liquids is explained in terms of individual and collective dynamics. The effective mobility arises as a collective effect which gives insight into the ene...

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Autores: Santamaria-Holek, Ivan, Pérez Madrid, Agustín
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/192691
Acceso en línea:https://hdl.handle.net/2445/192691
Access Level:acceso abierto
Palabra clave:Matèria condensada
Matèria condensada tova
Condensed matter
Soft condensed matter
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spelling Origin of the effective mobility in non-linear active micro-rheologySantamaria-Holek, IvanPérez Madrid, AgustínMatèria condensadaMatèria condensada tovaCondensed matterSoft condensed matterThe distinction between the damping coefficient and the effective non-linear mobility of driven particles in active micro-rheology of supercooled liquids is explained in terms of individual and collective dynamics. The effective mobility arises as a collective effect which gives insight into the energy landscape of the system. On the other hand, the damping coefficient is a constant that modulates the effect of external forces over the thermal energy which particles have at their disposition to perform Brownian motion. For long times, these thermal fluctuations become characterized in terms of an effective temperature that is a consequence of the dynamic coupling between kinetic and configurational degrees of freedom induced by the presence of the strong external force. The interplay between collective mobility and effective temperature allows to formulate a generalized Stokes-Einstein relation that may be used to determine the collective diffusion coefficient. The explicit relations we deduce reproduce simulation data remarkably well.American Institute of Physics (AIP)2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/192691Articles publicats en revistes (Física de la Matèria Condensada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1063/1.4964283Journal of Chemical Physics, 2016, vol. 145, num. 13, p. 134905https://doi.org/10.1063/1.4964283(c) American Institute of Physics (AIP), 2016info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1926912026-05-27T06:46:51Z
dc.title.none.fl_str_mv Origin of the effective mobility in non-linear active micro-rheology
title Origin of the effective mobility in non-linear active micro-rheology
spellingShingle Origin of the effective mobility in non-linear active micro-rheology
Santamaria-Holek, Ivan
Matèria condensada
Matèria condensada tova
Condensed matter
Soft condensed matter
title_short Origin of the effective mobility in non-linear active micro-rheology
title_full Origin of the effective mobility in non-linear active micro-rheology
title_fullStr Origin of the effective mobility in non-linear active micro-rheology
title_full_unstemmed Origin of the effective mobility in non-linear active micro-rheology
title_sort Origin of the effective mobility in non-linear active micro-rheology
dc.creator.none.fl_str_mv Santamaria-Holek, Ivan
Pérez Madrid, Agustín
author Santamaria-Holek, Ivan
author_facet Santamaria-Holek, Ivan
Pérez Madrid, Agustín
author_role author
author2 Pérez Madrid, Agustín
author2_role author
dc.subject.none.fl_str_mv Matèria condensada
Matèria condensada tova
Condensed matter
Soft condensed matter
topic Matèria condensada
Matèria condensada tova
Condensed matter
Soft condensed matter
description The distinction between the damping coefficient and the effective non-linear mobility of driven particles in active micro-rheology of supercooled liquids is explained in terms of individual and collective dynamics. The effective mobility arises as a collective effect which gives insight into the energy landscape of the system. On the other hand, the damping coefficient is a constant that modulates the effect of external forces over the thermal energy which particles have at their disposition to perform Brownian motion. For long times, these thermal fluctuations become characterized in terms of an effective temperature that is a consequence of the dynamic coupling between kinetic and configurational degrees of freedom induced by the presence of the strong external force. The interplay between collective mobility and effective temperature allows to formulate a generalized Stokes-Einstein relation that may be used to determine the collective diffusion coefficient. The explicit relations we deduce reproduce simulation data remarkably well.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/192691
url https://hdl.handle.net/2445/192691
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1063/1.4964283
Journal of Chemical Physics, 2016, vol. 145, num. 13, p. 134905
https://doi.org/10.1063/1.4964283
dc.rights.none.fl_str_mv (c) American Institute of Physics (AIP), 2016
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Institute of Physics (AIP), 2016
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Institute of Physics (AIP)
publisher.none.fl_str_mv American Institute of Physics (AIP)
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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